This is Leto's first SAG win, and the accolade marks his continued success among awards circles for the role. He has received a bevy of supporting actor honors, including awards from the L.A. Film Critics Assn. and New York Film Critics Circle, and more recently took home a Golden Globe. In addition, Leto is in the running for a supporting actor Oscar come March.

"I'm a big believer that the steeper the climb, the greater the view," Leto told The Times in November. "It's kind of the Everest thing: Why climb the mountain? Because it's there. I felt that way about Rayon — an impossible challenge."

With "Dallas Buyers Club," Leto resumes his acting career after taking a six-year hiatus to tour with his rock band, 30 Seconds to Mars. Leto's last feature role was in "Chapter 27," where he gained 67 pounds to portray the man who killed John Lennon.